کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6477809 | 1427606 | 2017 | 5 صفحه PDF | دانلود رایگان |
- Acidithiomicrobium was the dominant iron-oxidizer in Ni concentrate leaching at 49 °C.
- First specific demonstration of Acidithiomicrobium potential for base metal leaching.
- S. thermosulfidooxidans was the preferred moderate thermophile with Ni-Cu concentrate.
- Efficient Ni-Cu concentrate continuous leaching required high temperature archaea.
The ferrous iron- and sulfur-oxidizing Acidithiomicrobium was the dominant iron-oxidizing bacterium in a mixed culture of moderate thermophiles in a bioreactor with a high concentration of nickel in solution (20 g lâ1) and a continuous feed of nickel concentrate. This is the first demonstration specifically indicating that this bacterium could be used for industrial processing of a base metal sulfide concentrate. However, its sensitivity to copper determined that it was replaced by Sulfobacillus thermosulfidooxidans in the mixed culture when the feed was a nickel-copper concentrate. The extraction of copper from the nickel-copper concentrate by moderate thermophiles, despite fine grinding of the feed, was relatively poor (50% at 49 °C) compared to that achieved with high temperature archaea (92% at 77 °C) in single, continuous reactors with 5% w/v concentrate feeds and residence times of 2.7 and 2.5 days respectively.
Journal: Minerals Engineering - Volume 106, 15 May 2017, Pages 13-17